3/8” flex isn’t surface raceway, it’s used for connecting a rigid (EMT/IMC/RMC) conduit system to a vibrating piece of equipment like a motor or transformer, am

3/8” flex isn’t surface raceway, it’s used for connecting a rigid (EMT/IMC/RMC) conduit system to a vibrating piece of equipment like a motor or transformer, among other things. Wiremold 500 surface raceway is what I would recommend, it’s a basic surface raceway for electrical conductors or cables: https://www.legrand.us/wire-and-cable-management/raceway-and-cord-covers/steel/wiremold-500-700-series-small-raceway-white/p/700wh https://www.legrand.us/wire-and-cable-management/raceway-and... There are probably residential raceways that blend in better, but I’m not familiar with residential construction. There are plenty of ways to get a cable from point A to point B inside of a wall, particularly if you have a single story home with an unfinished attic and basement. A spade drill bit, a fish tape, and a multitool/rotozip can get a cable pretty much anywhere if you can drill a hole into the wall cavity from above or below.